CN103902117B - A kind of capacitive touch screen and preparation method thereof - Google Patents
A kind of capacitive touch screen and preparation method thereof Download PDFInfo
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Abstract
A kind of capacitive touch screen includes the FPC of polymeric substrates, ITO layer, ink layer and bonding on polymeric substrates；The ITO layer includes ITO pattern and ITO leads, and the ITO leads are used for connecting wire；The polymeric substrates are that hardness is greater than or equal to 4H, and the ITO layer is directly sputtered on the polymeric substrates.By touch control unit（ITO layer）It is integrated on the same substrate with cover sheet, it is simple in structure, at low cost without components such as cover board, OCA optical adhesive layers；Reduce workshop section, the ITO pattern layer bonding workshop section of cover board fitting, manufacture craft is simple；The hardness of used polymeric substrates is greater than or equal to 4H, and using effect is good.The preparation method of the capacitive touch screen provided, ITO layer is prepared using cryogenic vacuum magnetron sputtering technique, and carry out oxygen-enriched annealing, the crystallinity and light transmittance of ITO layer can thus be increased, and increase the adhesion of ITO layer and polymeric substrates, to improve the performance of the capacitive touch screen.
Description
Technical field
The present invention relates to field of electronic devices, and in particular to a kind of capacitive touch screen.
Background technology
Touch screen（Full name in English is Touch Panel）, also known as touch screen, touch panel are a kind of receivable contacts etc.
The induction type display device of input signal, is widely used in various electronic products.Operation principle according to touch screen and transmission
The medium of information, touch screen can be divided into four kinds：Resistance-type, condenser type, infrared-type and surface acoustic wave type.
Capacitive touch screen（Full name in English is Capacity Touch Panel, referred to as CTP）It is the electricity using human body
What influenza should control screen.When user touches CTP, since human body is there are electric field, user's finger is formed with working face
One coupled capacitor, because being connected to high-frequency current on working face, finger can siphon away the electric current of very little, this electric current point from touch points
It is not flowed out from the electrode on four angles of screen；Theoretically flow through the electric currents of four electrodes at a distance from finger to quadrangle at than
Touch position is calculated by the precision to four current ratios in example, controller, and up to 99%, the response time is less than accuracy
3ms。
CTP has many advantages, such as high sensitivity, multipoint-touch-technology easy to implement, is increasingly becoming smart mobile phone, tablet computer
The mainstream touch screen applied in equal electronic products.
In the prior art, according to the relative position of touch-control stepped construction and display panel, CTP can be divided into：Out cell (are touched
Control device outside be hung on outside display panel), on cell（Touch device is arranged on a display panel）With in cell（Touch device collection
At in display panel）Equal Technical Architectures.Although on cell and in cell can so that display panel is more frivolous, is referred to as
The ultimate solution that touch-control adds display, but technology it is immature it is low with yields restrict its application, out cell are still
Focus on the application solution.Out cell have OGS（Full name in English is One Glass Solution, is translated into monolithic glass solution
Scheme）、G/G（Full name in English is cover glass/glass sensor, is translated into double glass solutions）, (English is complete by G/F/F
Referred to as Cover Glass/Sensor Film X/Sensor FilmY, are translated into two thin walls solution).Wherein OGS, also known as
TOL（Full name in English is Touch On Lens, is translated into cover board touch-control）ITO conductive films and touch device are formed directly into cover board
On glass, since one block of glass plays a dual role of cover-plate glass and touch sensing simultaneously, and also it is simple in structure, more light
Thin, simplified technique reduces cost, yields height, is increasingly becoming the mainstream of CTP development.
The best coating temperature of ITO is 380 DEG C, is far above the thermal softening temperature of polymeric substrates, therefore in the prior art,
The substrate of CTP is mostly glass substrate.But glass substrate is frangible, security performance is low, quality is big, it is often more important that yields is low,
Always so that the cost of CTP is high.And polymeric substrates are light, safety coefficient is high and cheap easy processing can be with
Cost is largely reduced, if but using polymeric substrates, the coating temperature of ITO will be strict controlled in the polymer matrix
The softening temperature of plate is hereinafter, this results in the problems such as ITO layer crystallinity is not high, and light transmittance is low, and resistance value is higher and unstable, sternly
Ghost image rings the quality of CTP, and the hardness of Common Polymers substrate is relatively low, directly affects the using effect of CTP, therefore market
The CTP of upper rarely seen polymeric substrates.
In view of the above-mentioned problems, Chinese patent CN202533921U discloses a kind of ultra-thin capacitance type touch control screen, including substrate
Layer, glue-line, pattern layer, the IC and FPC of display screen and binding on the substrate layer（Full name in English is Flexible Printed
Circuit is translated into flexible printed circuit board）Component, pattern layer include substrate sheets and the ITO that is arranged in substrate sheets（It is English complete
Referred to as Indium tin oxide, are translated into tin indium oxide）Pattern, the substrate sheets are film, and the ITO pattern single side is plated in
ITO pattern film is formed on film, the substrate layer is acrylic substrate.The utility model is solved using acrylic substrate
The thickness that is brought in the prior art using tempered glass panel and the problem that quality is big, yields is low；But ITO is plated in phenanthrene
On forest tract, then by glue-line glue panel and with the film of ITO pattern, making step is not only increased, and increased
Glue-line and film influence that the thickness of touch screen can be increased and reduce light transmittance, it is often more important that the use of glue-line unavoidably has
The generation of bubble further reduced the yields of touch screen, increase production cost.
Invention content
For this purpose, it is to be solved by this invention be in the prior art the capacitive touch screen structure of polymer matrix film and prepare work
The problem that skill is complicated, yields is low, using effect is poor, provide a kind of structure and it is simple for process, yields is high, using effect is good
Capacitive touch screen and preparation method thereof.
In order to solve the above technical problems, the technical solution adopted by the present invention is as follows：
A kind of capacitive touch screen, including polymeric substrates, ITO layer, ink layer and bonding are on polymeric substrates
FPC；The ITO layer includes ITO pattern and ITO leads, and the ITO leads are used for connecting wire；The polymeric substrates it is hard
Degree is greater than or equal to 4H, and the ITO layer is directly arranged on the polymeric substrates.
The polymeric substrates are acrylic substrate or acrylic/makrolon composite substrate.
The thickness of the polymeric substrates is 0.5~1.2mm.
The thickness of the ITO layer is 40~50nm.
The thickness of the ink layer is 6 ~ 25 μm.
The ink layer includes dielectric ink region and electrically conductive ink region.
Conductor layer is provided on the ink layer, the conducting wire in the conductor layer is for connecting ITO leads and FPC.
The thickness of the conductor layer is 5~10 μm.
The conducting wire is silver paste line or molybdenum aluminium molybdenum wire.
The present invention also provides a kind of methods preparing capacitive touch screen, include the following steps：
S1, it cuts, cleaning cleaning polyalcohol substrate；
S2, the vacuum magnetic-control sputtering ITO layer on polymeric substrates, coating temperature are less than or equal to 80 DEG C；
S3, ITO polymeric substrates obtained in S2 are placed under oxygen atmosphere and are annealed, annealing temperature is less than 90 DEG C, the time
For 20-40min；
S4, ITO layer is etched to ITO pattern and ITO leads；
Display area and non-display area are divided on S5, ito substrate obtained in S4, using silk-screen printing technique,
It in non-display area printing ink layer, and toasts, the ink layer includes dielectric ink region and electrically conductive ink region；
S6, conductor layer is prepared on ink layer obtained in step s 5, the conducting wire in the conductor layer passes through electrically conductive ink
Region connects ITO leads；
Obtained contour substrate in S7, finishing impression step S6；
S8, bonding FPC.
The polymeric substrates are the polymeric substrates that hardness is greater than or equal to 4H.
Polymeric substrates of the hardness more than 4H are PMMA substrates or PMMA/PC composite substrates.
The thickness of the polymeric substrates is 0.5~1.2mm.
The thickness of the ITO layer is 40~50nm.
The thickness of the ink layer is 6~25 μm.
The thickness of the conductor layer is 5~10 μm, and the conducting wire is silver paste line or molybdenum aluminium molybdenum wire.
The present invention provides a kind of capacitive touch screen prepared by above-mentioned preparation method.
The present invention provides a kind of capacitive touch screen prepared by above-mentioned preparation method.
The above technical solution of the present invention has the following advantages over the prior art：
1, capacitive touch screen unit provided by the invention（ITO layer）It is integrated on the same substrate with cover sheet,
It is simple in structure, at low cost without components such as cover board, OCA optical adhesive layers, the thickness of touch screen can be reduced.Used polymer
The hardness of substrate is greater than or equal to 4H, and using effect is good.Reduce the workshop section of cover board fitting and the work of ITO pattern layer bonding
Section, manufacture craft are simple.
2, using polymeric substrates, tempered glass than in the prior art is at low cost, light and be not easy to scratch, and is making
Yields is high during standby；Polymeric substrates are non-friable, in use, can exempt the security risk that glass substrate is brought.
3, the preparation method of capacitive touch screen provided by the present invention is prepared using cryogenic vacuum magnetron sputtering technique
ITO layer, and oxygen-enriched annealing is carried out, it can thus make the low price indium tin oxide obtained at low temperature in ITO layer continue
It is reacted with oxygen, generates high price tin indium oxide, recrystallize；The crystallinity and light transmittance of ITO layer can not only be increased, and increased
The adhesion of ITO layer and polymeric substrates, to improve the performance of the capacitive touch screen.
Description of the drawings
In order to make the content of the present invention more clearly understood, it below according to specific embodiments of the present invention and combines
Attached drawing, the present invention is described in further detail, wherein
Fig. 1 is capacitive touch screen structure schematic diagram provided by the present invention；
Fig. 2 is capacitive touch screen preparation method flow chart provided by the present invention；
Fig. 3 a are the scratch test curves of capacitive touch screen ITO layer provided in comparative example；
Fig. 3 b are the scratch test curves of capacitive touch screen ITO layer provided in embodiment.
Reference numeral is expressed as in figure：1- polymeric substrates, 11- non-display areas, the display areas 12-, 2-ITO layers, 3-
Ink layer, 31- dielectric inks region, 32- electrically conductive inks region, 4- conductor layers, 5-FPC.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the reality of the present invention
The mode of applying is described in further detail.
Embodiment
The present embodiment provides a kind of capacitive touch screens, as shown in Fig. 1, including polymeric substrates 1, ITO layer 2 and nation
The FPC5 being scheduled on substrate；Polymeric substrates 1 are divided into display area 12 and non-display area 11, and FPC5 bondings are in non-display area
Domain 11, ITO layer 2 are made of ITO pattern and ITO leads；The ITO layer 2 is directly sputtered in polymer matrix by vacuum sputtering stove
On plate 1.
Polymeric substrates 1 described in the present embodiment be PMMA/PC composite substrates, be purchased from MSK companies of Japan, hardness 4H,
Thickness is 1.0mm, specification 370*470mm.As the convertible embodiment of the present invention, the polymeric substrates 1 are that hardness is big
In or equal to 4H polymeric substrates, thickness be 0.8~1.2mm, the purpose of the present invention may be implemented, belong to the present invention guarantor
Protect range.
The thickness of the ITO layer 2 is 40nm, and the non-display area 11 is provided with ink layer 3, the thickness of the ink layer 3
Degree is 14 μm, the effect for covering FPC5 and beauty；The ink layer is by dielectric ink region 31 and electrically conductive ink region
32 compositions, dielectric ink region 31 also acts as the insulating effect between ITO layer 2 and FPC5,32 company of playing of electrically conductive ink region
Connect the effect of conducting wire in ITO leads and the conductor layer 4 in the ITO layer 2.The dielectric ink is cover board ink, described to lead
Electric ink is conductive carbon paste ink, is purchased from Japanese Seiko.As the convertible embodiment of the present invention, the thickness of the ITO layer 2
Thickness for 40~50nm, the ink layer 3 is 6 ~ 25 μm, and the purpose of the present invention may be implemented, and belongs to the protection of the present invention
Range.
Conductor layer 4 is provided on ink layer 3, the conducting wire in the conductor layer 4 is set by the connection of electrically conductive ink region 32
Set the ITO conducting wires in the ITO layer 2 below the ink layer 3.The conducting wire is silver paste line, molybdenum aluminium molybdenum wire, other conductions
Metal wire or alloy wire.Preferred silver paste line in the present embodiment, silver paste are purchased from Japanese morning sun, and silver paste line passes through screen printing
Prepared by dataller's skill, for the ITO leads and the FPC5 to be connected, wherein silk-screen printing technique can also be changed to slot coated work
The purpose of the present invention equally may be implemented in skill, belongs to the scope of protection of the present invention.
Either alloy wire can be prepared by sputtering or electroplating technique for the molybdenum aluminium molybdenum wire and other conductive metal wires
At conductive film, conducting wire is then prepared by the method for etching again, the purpose of the present invention equally may be implemented, belongs to the present invention's
Protection domain.
Capacitive touch screen unit provided by the invention（ITO layer）Integrated on the same substrate, the nothing with cover sheet
The components such as palpus cover board, OCA optical adhesive layers, it is simple in structure, at low cost, the thickness of touch screen can be reduced.Reduce cover board fitting
Workshop section and the workshop section of ITO pattern layer bonding, manufacture craft are simple.Substrate is polymeric substrates, tempering than in the prior art
Glass is at low cost, light and be not easy to scratch, and yields is high in preparation process；Polymeric substrates are non-friable, in use, can
To exempt the security risk that glass substrate is brought.
The specific preparation method of above-mentioned capacitive touch screen is as follows：
S1, it cuts, cleaning cleaning polyalcohol substrate 1, polymeric substrates 1, which are plated AR optical adjustment layers, does the shadow processing that disappears.
S2, polymeric substrates obtained in step S1 are put into vacuum sputtering stove using sputtering vacuum deposition method in substrate
One layer of ITO layer 2 of upper sputtering, 80 DEG C of coating temperature.ITO is directly sputtered on polymeric substrates 1, the knot of touch screen can be simplified
Structure reduces the thickness of touch screen, and using polymeric substrates 1, tempered glass than in the prior art is at low cost, light and be not easy to scrape
Wound, and yields is high in preparation process.
S3, ITO polymeric substrates obtained in S2 are placed under oxygen atmosphere and are annealed, annealing temperature is 89 DEG C, and the time is
30min.Carry out oxygen-enriched annealing, can thus make the low price indium tin oxide obtained at low temperature in ITO layer continue with
Oxygen reacts, and generates high price tin indium oxide, recrystallizes；The crystallinity and light transmittance of ITO layer can not only be increased, and increased
The adhesion of ITO layer and polymeric substrates.
S4, using etching technics, ITO layer 2 is etched into ITO pattern and ITO leads.
S5, display area 12 and non-display area 11 are divided on ITO polymeric substrates obtained in step s 4；Using silk
Net printing technology, in non-display area printing ink layer 3, thickness is 12 μm, and 60 DEG C of 10~30min of baking, the ink layer 3
Including dielectric ink region 31 and electrically conductive ink region 32.
S6, using silk-screen printing technique, conductor layer is prepared on ink layer 3 obtained in step s 5, thickness is 8 μm, and
60 DEG C of UV light irradiate 5~10min, and silver paste line one end in the conductor layer 4 is arranged on the electrically conductive ink region 32, connection
The ITO leads.
S7, using CNC（Full name in English is Computer Numerical Control, is translated into computer numeral control）Finishing impression
The substrate integrated in step S6 is carved out shape by machine.
S8, by FPC and wire bond.
In order to further embody the advantage of capacitive touch screen provided by the present invention, spy implements comparative example, for reference.
Comparative example
The capacitive touch screen structure and reality provided in capacitive touch screen and embodiment provided in this comparative example
It is identical to apply mode, it is unique the difference is that without oxygen-enriched annealing after step S2 preparation ito films.
By light transmittance tester, sheet resistance tester to capacitive touch screen obtained in above-described embodiment and comparative example
Light transmittance and sheet resistance tested；The surface smoothness of ito film is by root mean square roughness value in the capacitive touch screen
（RMS value）Characterization, is measured with white light interferometer；The adhesive force of ito film and the polymeric substrates in the capacitive touch screen
It is measured by nano impress method.
It is as shown in the table to the test data of embodiment and the ito film of capacitive touch screen in comparative example：
As can be seen from the above table, in embodiment by the light transmittance higher of the capacitive touch screen of oxygen-enriched annealing,
Sheet resistance value then substantially reduces, and surface roughness declines, flatness higher.In comparative example and the provided capacitive touch screen of embodiment
The adhesive force of ITO layer and polymeric substrates measures curve graph respectively as shown in Fig. 3 a, 3b by nano impress method, solid line table in figure
Show that normal force and position curve, dotted line indicate cross force and position curve.The principle of ITO adhesive force is analyzed according to scarification, i.e.,
The position that cross force appearance is obviously fluctuated is more forward, and adhesive force is poorer, this theoretical foundation can be seen that in embodiment and be made
Ito film adhesive force effect compared with having clear improvement in comparative example.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
Variation is still in the protection scope of this invention.
Claims (8)
1. a kind of method preparing capacitive touch screen, which is characterized in that include the following steps：
S1, it cuts, cleaning cleaning polyalcohol substrate；
S2, the vacuum magnetic-control sputtering ITO layer on polymeric substrates, coating temperature are less than or equal to 80 DEG C；
S3, ITO polymeric substrates obtained in S2 are placed under oxygen atmosphere and are annealed, annealing temperature is less than 90 DEG C, time 20-
40min；
S4, ITO layer is etched to ITO pattern and ITO leads；
Display area and non-display area are divided on S5, ito substrate obtained in S4, using silk-screen printing technique, non-
Display area printing ink layer, and toast, the ink layer includes dielectric ink region and electrically conductive ink region；
S6, conductor layer is prepared on ink layer obtained in step s 5, the conducting wire in the conductor layer passes through electrically conductive ink region
Connect ITO leads；
Obtained contour substrate in S7, finishing impression step S6；
S8, bonding FPC.
2. preparation method according to claim 1, which is characterized in that the polymeric substrates are that hardness is greater than or equal to 4H
Polymeric substrates.
3. preparation method according to claim 2, which is characterized in that polymeric substrates of the hardness more than 4H are PMMA
Substrate or PMMA/PC composite substrates.
4. preparation method according to claim 3, which is characterized in that the thickness of the polymeric substrates be 0.5~
1.2mm。
5. according to any preparation methods of claim 1-4, which is characterized in that the thickness of the ITO layer is 40~50nm.
6. preparation method according to claim 1, which is characterized in that the thickness of the ink layer is 6~25 μm.
7. preparation method according to claim 1, which is characterized in that the thickness of the conductor layer is 5~10 μm, described to lead
Line is silver paste line or molybdenum aluminium molybdenum wire.
8. a kind of capacitive touch screen prepared according to any preparation method of claim 1-4 or 6 or 7.
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| CN104461145A (en) * | 2014-12-11 | 2015-03-25 | 深圳市华星光电技术有限公司 | Touch screen and production method thereof |
| CN105068703A (en) * | 2015-08-01 | 2015-11-18 | 贵州达沃斯光电有限公司 | Integrated capacitive touch panel and manufacture method thereof |
| CN106201139A (en) * | 2016-07-06 | 2016-12-07 | 深圳市骏达光电股份有限公司 | A kind of processing technology of TP monolayer multiple spot GFM |
| CN107402678A (en) * | 2017-08-11 | 2017-11-28 | 业成科技（成都）有限公司 | Touch control display apparatus |
| CN107759106A (en) * | 2017-09-27 | 2018-03-06 | 广东星弛光电科技有限公司 | A kind of manufacture method of mobile phone capacitive touch screen cover-plate glass |
| CN110618734A (en) * | 2019-08-28 | 2019-12-27 | 武汉华星光电半导体显示技术有限公司 | Display device and manufacturing method thereof |
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| JP5149878B2 (en) * | 2009-08-27 | 2013-02-20 | 住友化学株式会社 | Transparent resin laminate |
| KR101020766B1 (en) * | 2010-08-13 | 2011-03-09 | (주)유시스텍 | Making method for transparency electrically conductive film |
| CN102184682B (en) * | 2011-04-27 | 2014-02-19 | 冠捷显示科技（厦门）有限公司 | Optical grade plastic transparent cut display and manufacturing method thereof |
| CN202166996U (en) * | 2011-06-28 | 2012-03-14 | 昆山榕增光电科技有限公司 | Multifunctional touch control device |
| CN203149539U (en) * | 2012-12-31 | 2013-08-21 | 昆山维信诺显示技术有限公司 | Capacitive touch screen |
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| CN102243543A (en) * | 2010-05-11 | 2011-11-16 | 昆山榕增光电科技有限公司 | Touch panel and manufacturing method thereof |
| CN102819372A (en) * | 2012-08-08 | 2012-12-12 | 赣州市德普特科技有限公司 | Capacitive touch screen and manufacturing method thereof |
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